摘要
在哈特曼波前传感器点源目标探测质心算法中,除信号光子噪声、读出噪声和背景光噪声等误差源之外,图像传感器上存在的盲元也会对质心的探测精度造成一定的影响。系统地推导了哈特曼传感器子孔径光斑区域内存在单个盲元条件下各种误差源对点源目标质心探测误差影响的数学表达式,进一步分析了盲元和光斑质心间相对距离、光斑等效高斯宽度等因素对盲元存在所引入的质心偏移误差的影响,指出当相对距离约等于光斑高斯宽度时质心偏移误差达到最大值。实验结果与仿真和理论推导结果相符。
In the detection of a point source with Hartmann wavefront sensor, besides the normal noise sources such as signal photon noise, readout noise and background noise, the blind pixels existing on the image sensor may also introduce centroid detection error. The integral formula of centroid detection error in the presence of a single blind pixel in the spot area is put forward. Furthermore, analysis about the two influence factors of centroid displacement error induced by single blind pixel, i. e., the distance between single blind pixel and spot center and the Gaussian width of the spot is presented. The simulation and experimental results are in accordance with the theoretical analysis.
出处
《激光与光电子学进展》
CSCD
北大核心
2012年第3期43-49,共7页
Laser & Optoelectronics Progress
基金
国家863计划(2008AA02Z422)资助课题
关键词
自适应光学
探测器
质心探测误差
误差分析
单个盲元
点源
adaptive optics
detectors
centroid detection error
error analysis
single blind pixel
point source
